Page 28 of 354
Q: What's wrong  with  this? 
-IOU ci.. be serio --., .njured  by a twisted  b _._. 
In a crash,  you wouldn't  have  the  full width  of 
the  belt to  spread impact  forces. 
If a  belt is 
twisted, make it straight so it can work 
properly,  or ask  your  dealer  to 
fix it. 
L I I I I I I I I I 1 
A: The belt is twisted across the  bodv. 
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        Page 272 of 354

Uniform Tire Quality  Grading 
Mixing  tires  could  cause  you  to  lose  control 
while  driving.  If  you  mix  tires  of  different  sizes  or  types  (radial  and bias-belted  tires),  the 
vehicle  may  not  handle  properly,  and  you  could  have  a  crash. Using  tires 
of different 
sizes  may  also  cause  damage  to  your  vehicle. 
Be  sure  to  use  the  same  size  and  type  tires  on 
all  wheels. 
It's all  right  to  drive  with  your 
compact  spare, though. 
It was  developed  for 
use  on  your  vehicle. 
I If you use bias-ply  tires  on  your  vehicle.  the I 
wheel  rim  flanges  could  develop  cracks  after 
many  miles  of  driving. 
A tire  and/or  wheel 
could  fail  suddenly,  causing  a  crash.  Use only 
radial-ply  tires  with  the  wheels  on  your  vehicle.  Quality grades can 
be found  where  applicable  on the 
tire sidewall between tread  shoulder and maximum 
section width.  For example: 
Treadwear 200 Traction AA Temperature A 
The following  information relates  to the system 
developed  by the  United  States National Highway 
Traffic  Safety Administration,  which grades tires  by 
treadwear, traction and temperature performance. (This 
applies only to  vehicles sold in the United States.) 
The grades are molded  on the sidewalls  of most 
passenger car  tires. The  Uniform Tire Quality Grading 
system does  not apply  to deep  tread,  winter-type 
snow  tires,  space-saver or  temporary use spare tires, 
tires with  nominal  rim diameters  of 10  to 12  inches 
(25  to 
30 cm),  or  to  some limited-production tires. 
While the tires available 
on General  Motors passenger 
cars and  light trucks may  vary  with respect to these 
grades,  they must  also conform  to federal safety 
Performance Criteria  (TPC)  standards. 
,t=yuj,.e!i-l-,-i-lis &;-,d dddiiisi-,a; &-,erd; ;";otsrs TiTG 
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        Page 274 of 354

Wheel Replacement 
Replace  any  wheel  that is bent, cracked  or badly rusted 
or  corroded.  If  wheel  nuts keep  coming  loose,  the 
wheel,  wheel  bolts and  wheel  nuts should  be replaced. 
If the  wheel  leaks air,  replace  it  (except some 
aluminum  wheels,  which  can sometimes  be  repaired). 
See  your  dealer 
if any of these conditions exist. 
Your  dealer  will know  the  kind of wheel  you  need. 
Each  new  wheel  should have the same  load-carrying 
capacity,  diameter,  width, offset and  be  mounted 
the  same  way  as the  one  it replaces. 
If you  need to replace  any  of  your  wheels? wheel bolts 
or  wheel  nuts,  replace them only with  new 
GM 
original  equipment  parts.  This way,  you  will be sure  to 
have  the  right  wheel,  wheel  bolts and  wheel  nuts 
for  your  vehicle.  Using  the  wrong  replacement  wheels,  wheel 
bolts  or 
wheel 
nuts on  your  vehicle  can  be 
dangerous. 
It could  affect  the  braking  and 
handling 
of your  vehicle,  make  your  tires  lose 
air  and  make  you  lose  control.  You  could  have 
a  collision  in  which  you  or  others  could  be  injured.  Always  use  the  correct  wheel,  wheel 
Notice: The  wrong  wheel  can  also  cause  problems 
with  bearing  life,  brake  cooling,  speedometer  or 
odometer  calibration,  headlamp  aim,  bumper  height, 
vehicle  ground  clearance  and  tire  or  tire  chain  clearance  to  the  body  and  chassis. 
See 
Changing a Flat Tire  on page 5-62 for  more 
mtormatlon. 
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